Question

plz help guys
plz plz plz​

Answer 1

Answer:

For cylinder, we have

base radius=r, height=h

∴S

1

=Curved surface=2πrh

For cone, we have

l=

r

2

+h

2

and, S

2

=πrl=πr

r

2

+h

2

We have,

S

2

S

1

=

5

8

⇒

πr

r

2

+h

2

2πrh

=

5

8

⇒

r

2

+h

2

2h

=

5

8

⇒

r

2

+h

2

4h

2

=

25

64

⇒25h

2

=16r

2

+16h

2

⇒9h

2

=16r

2

⇒3h=4r

⇒

r/h

=

4

3

.

Answer 2

Answer:

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